- Abington
- Social Library Association of Abington [1]
- Barkhamsted
- Barkhamsted Library (est.1797) [2]
- Berlin
- Kensington Parish Library, Berlin (est. ca.1788) [2]
- Bristol
- First Society in Bristol (est.1792) [2]
- Brooklyn
- Union Library, Brooklyn (est.1774) [2]
- Chatham
- Republican Library Company, Chatham (est.1795) [2]
- Chelsea
- T. Hubbard's circulating library, Chelsea [3]
- Cheshire
- Cheshire Library Society (est.1792) [2]
- Library in Salem Society, Cheshire (est.1783) [2]
- Library in the Society of Columbia, Cheshire (est.1793) [2]
- Cornwall
- United Proprietors Library, Cornwall (ca.1799-1804) [2]
- Danbury
- Franklin Library, Danbury (1770–1833) [2]
- Library in Bethel Society, Danbury (est.1793) [2]
- Durham
- Book Company of Durham (1733–1856)
- Ethosian Society, Durham (1787–1793) [2]
- New Library Company, Durham (est.1788) [2]
- East Haddam
- Hadlyme Society, East Haddam (est.179) [2]
- East Hartford
- First Library Company, East Hartford (est.1794) [2]
- Union Library, East Hartford (est.1791) [2]
- East Haven
- Union Library, East Haven (est.1796) [2]
- East Windsor
- Federal Library, East Windsor (est. ca.17890 [2]
- Social Library in East Windsor (est.1791) [2]
- Farmington
- Library in First Society, Farmington (est.1795) [2]
- Northington Public Library, Farmington (1789-ca.1799) [2]
- Franklin
- Franklin Library, Franklin (est.1790) [2]
- Griswold
- North Preston Parish Library, Griswold (est.1761) [2]
- Union Circle of Friends, Griswold (1795–1821) [2]
- Guilford
- Library of Killingworth, Lyme, Saybrook and Guilford (est.1737; located in Guilford) [2]
- Library of Saybrook, Lime, and Guilford [4]
- Library in First Society, Guilford (est.1790) [2]
- Hadlyme
- Hadlyme Library (est.1789) [2] [5]
- Hartford
- Hartford Library Company [6] [7]
- Harwinton
- Episcopalian Society Library, Harwinton (est.1793) [2]
- Juvenile Library, Harwinton (est.1797) [2]
- Union Harwinton Library (1798–1857) [2] [8]
- Lebanon
- Philogrammatican Society, Lebanon [9]
- Litchfield
- St. Paul's Lodge Library, Litchfield (est.1781) [2] [10]
- Madison
- Farmer's Library, Madison (est.1793) [2]
- Mansfield
- Proprietors Library North Society, Mansfield (est.1795) [2]
- Proprietors Library South Society, Mansfield (est.1795) [2]
- Middletown
- Library Company in Middletown (est.1765) [2]
- Middletown Library [11] [12]
- Milford
- Associate Library, Milford (1761–1820) [2]
- Milford Library (est.1745) [2]
| - Naugatuck
- Library in Salem Society, Naugatuck (est.1783) [2]
- New Haven
- New London
- S. Green's Circulating Library, New London [16]
- New Milford
- Union Library, New-Milford (est.1796) [2]
- Newington
- Book Company in Newington (est.1752) [2]
- Charity Library, Newington (est.1787) [2]
- North Haven
- Northill Library, North Haven (est.1792) [2]
- Northington
- Northington Public Library [17]
- Norwich
- Franklin Library Company, Norwich [18]
- Library in First Society, Norwich (est. 1796) [2]
- Norwich Library Company (est.1793) [19]
- John Trumbull's circulating library, Norwich (est.1796) [20]
- Samuel Trumbull's circulating library, Norwich [21]
- Pomfret
- Social Library of Abington in Pomfret (est.1793) [2]
- United English Library for the Propagation of Christian and Useful Knowledge, Pomfret (1739–1805) [2]
- Saybrook
- Library of Second Society, Saybrook (est.1795) [2]
- Southington
- Union Library Society, Southington (1797–1847) [2]
- Stonington
- Stonington Point Library (est.1793) [2]
- Suffield
- Suffield Library (est.1791) [2]
- Tolland
- Tolland Proprietary Library (est.1787) [2]
- Torrington
- Public Library of Torrington and Winchester (est.1787; located in Torrington) [2]
- Warren
- Free Mason Lodge Library, Warren (est.1799) [2]
- Public Library in Warren (est.1770) [2]
- Warren library [22]
- Waterbury
- Library in First Society, Waterbury (est.1771) [2]
- Union Library, Waterbury (est. ca.1797) [2]
- Watertown
- Union Library Society, Watertown (est.1799) [2]
- West Simsbury
- Friendship Library, West Symsbury (est.1793) [23]
- Weston
- North Fairfield Library, Weston (est. ca.1790) [2]
- Wethersfield
- Social Library in Stepney Parish, Wethersfield (est.1794) [2]
- Union Library Society of Wethersfield (1783–1850) [2] [24]
- Winchester
- Society of Winsted, Winchester (est.1799) [2]
- Windham
- Library Company in Scotland, Widham (1791–1830) [2]
- Library in First Society, Windham (ca.1795-1798) [2]
- Wolcott
- Library in Farmingbury, Wolcott (est.1779) [2]
- Woodbridge
- Library in Woodbridge (est.1787) [2] [25]
- Woodbury
- Union Library, Woodbury (est.1772) [2]
- Woodstock
- Library of First Society, Woodstock (est.1797) [2]
- United Lyon Library of Woodstock, [26] also called: United Lynn Library (est.1768) [2]
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